frameworks/base:(Hack)Print the content of textview

This hack allows us to print content of Textview
when ro.debug.textview is set . This allows us
to capture the contents of textview which will help
us capture benchmark results for thirdparty apps
which use TextView to display results.

Change-Id: I3500cc35b37c08d93e24ccaf12dcce359fc84da2
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>